Question: What is date of birth of Flavius Aetius that is instance of is statement with Gregorian date earlier than 1584 ?
Paraphrase: When was Flavius Aetius born?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q185476 p:P569 ?s . ?s ps:P569 ?obj . ?s pq:P31 wd:Q26961029 }